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參數(shù)資料
| 型號(hào)： | UC3845A |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | High Performance Current Mode PWM Controller(高性能電流模式PWM控制器) |
| 中文描述： | 高性能電流模式PWM控制器（高性能電流模式的PWM控制器） |
| 文件頁數(shù)： | 2/15頁 |
| 文件大小： | 138K |
| 代理商： | UC3845A |
* All voltages are with respectto pin5, all currents arepositive intothe specifiedterminal.
PIN CONNECTION
(top view)
COMP
V
FB
I
SENSE
R
T
/C
T
GROUND
OUTPUT
Vi
V
REF
1
3
2
4
6
5
7
8
D95IN332
Minidip/SO8
ORDERINGNUMBERS
SO8
Minidip
UC2842AD1; UC3842AD1
UC2843AD1; UC3843AD1
UC2844AD1; UC3844AD1
UC2845AD1; UC3845AD1
UC2842AN; UC3842AN
UC2843AN; UC3843AN
UC2844AN; UC3844AN
UC2845AN; UC3845AN
ABSOLUTE MAXIMUM RATINGS
Symbol
V
i
V
i
I
O
E
O
Parameter
Value
30
Self Limiting
±
1
5
– 0.3 to 5.5
10
1.25
800
– 65 to 150
300
Unit
V
Supply Voltage (low impedance source)
Supply Voltage (Ii < 30mA)
Output Current
Output Energy (capacitive load)
Analog Inputs (pins 2, 3)
Error Amplifier Output SinkCurrent
Power Dissipation at T
amb
≤
25
°
C (Minidip)
Power Dissipation at Tamb
≤
25
°
C (SO8)
Storage Temperature Range
Lead Temperature (soldering 10s)
A
μ
J
V
mA
W
mW
°
C
°
C
P
tot
P
tot
T
stg
T
L
PIN FUNCTIONS
No
1
Function
COMP
Description
This pin is the Error Amplifier output and is made available for loop compensation.
2
V
FB
This is the inverting input of the Error Amplifier. It is normally connected to the switching
power supply output through a resistor divider.
A voltage proportional to inductor current is connected to this input. The PWM uses this
information to terminate the output switch conduction.
The oscillator frequency and maximum Output duty cycle are programmed by connecting
resistor R
T
to Vref and cpacitor C
T
to ground. Operation to 500kHz is possible.
This pin is the combined control circuitry and power ground.
3
I
SENSE
4
R
T
/C
T
5
GROUND
6
OUTPUT
This output directly drives the gate of a power MOSFET. Peak currents up to 1A are sourced
and sunk by this pin.
This pin is the positive supply of the control IC.
7
V
CC
V
ref
8
This is the reference output. It provides charging current for capacitor C
T
through resistor R
T
.
UC2842A/3A/4A/5A - UC3842A/3A/4A/5A
2/15
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| UC3845B | High Performance Current Mode PWM Controller(高性能電流模式PWM控制器) |
| UC3843B | High Performance Current Mode PWM Controller(高性能電流模式PWM控制器) |
| UC621XX | CMOS IC |
| UC621XX-AF5-R | CMOS IC |
| UC621XXL-AF5-R | CMOS IC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UC3845A-BW | 制造商:FCI 制造商全稱:First Components International 功能描述:Current Mode PWM Controller Low Start-Up and Operating Current |
| UC3845AD | 功能描述:電流型 PWM 控制器 Current Mode RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| UC3845AD1 | 功能描述:電流型 PWM 控制器 RO 511-UC3845BD 9/04 RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| UC3845AD1013TR | 制造商:STMicroelectronics 功能描述: |
| UC3845AD8 | 功能描述:電流型 PWM 控制器 Current Mode RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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